Uses: Use to kill over 200 destructive caterpillars and worms. Biological extract. BT is highly effective against pest caterpillars and worms but harmless to other species outside the Lepidoptera family of insects which makes it ideal to use. Very safe to be around. Once the pest consumes the BT on the foliage it immediately gets sick and dies. This is a great way to get rid of sod webworms, tent caterpillars, army worms, tomato hornworm ect.